code: def __getitem__(self, key):
      record = self.get_record(key)
      if record is None:
          return None
      return record.content
  
file_path: mindsdb/mindsdb/interfaces/storage/json.py
imports: from mindsdb.interfaces.storage import db
  from mindsdb.interfaces.storage.fs import RESOURCE_GROUP
  from mindsdb.utilities.context import context
  from mindsdb.utilities import log
label_desc: Use image node_id 4 for calling the JsonStorage obj's underlying member method code with example usage: obj.__getitem__(key) and returns: record, None